Continuity: Some 12 minutes into the show, Dr. Price explains that the captive bolt gun works with compressed air. That's why the victim didn't have gunpowder burns around the wound. At 33 minutes, Calleigh and Delko do the GSR test to a suspect and when the test is positive, they come into conclusion that he is the murderer. However, the GSR test wouldn't be conclusive one way or another with a compressed air gun.
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